Clairvoyance (die in film)

A spectator is shown a dice and asked to think of a number from 1-6. He is then handed a black cannister and asked to place the thougt of number face up into the cannister and screw the top on. The cannister is shown to be solid with no way of seeing he dice. It is then placed into a larger caniister. They hold the cannister and think of their number............. You reveal the thought of number which is confirmwd when the cannisters are opened.